99981245 has 24 divisors (see below), whose sum is σ = 148484736. Its totient is φ = 63281088.

The previous prime is 99981229. The next prime is 99981251. The reversal of 99981245 is 54218999.

It is not a de Polignac number, because 99981245 - 2⁴ = 99981229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 99981245.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2537 + ... + 14366.

It is an arithmetic number, because the mean of its divisors is an integer number (6186864).

Almost surely, 2^99981245 is an apocalyptic number.

It is an amenable number.

99981245 is a deficient number, since it is larger than the sum of its proper divisors (48503491).

99981245 is a wasteful number, since it uses less digits than its factorization.

99981245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16941 (or 16928 counting only the distinct ones).

The product of its digits is 233280, while the sum is 47.

The square root of 99981245 is about 9999.0622060271. The cubic root of 99981245 is about 464.1298638808.

The spelling of 99981245 in words is "ninety-nine million, nine hundred eighty-one thousand, two hundred forty-five".